Gearing



F. MATHEWS GEARNG Filed March l5 1924 3 Shen?"afer-Shea?l l m, wm,11508564 F. MATHEVVS GEARNG Filed March l5. 1924 3 Sheets-Sheet 2 @ng3uh M www Sem. 16, i924@ @$508,554

F. MA1-NEWS GEARING Filed March 15. 1924 5 Sheets-Sheet 3 Panarea sept.1e, 1924.

.rm rarnnws, or cHIcAGo, ILLINoIs.

Gemine.

' -To dll concern. 'i

.f izen of theUnited StatesVandA resident of i Chicago, in the county ofCook and State of ally diminished'as" the gear ratio changes owing tothe pcc Illinois, have'invented certain new and useful Improvements inGearin of which the following is a full, clear, an Yexact descrip- Ition, suchA as will enable others skilldinxthe art to make and use thesame.

particularly to a mechanism 1n which the ratio between the ears isgraduall changed,

'ar formation cry ture,.so that the driven gear may be, initiallyrotated at a fast speed that i s graduso that increased; .power isobtained as the speed of the driven gear is reduced.

One of the objects of my invention is toprovide a geanmechanism that isadapted for use in connection with the operation of the drawer rod ofrailroad car hand brakes .so that thewslackof Athechain'or cable may betaken vup rapidlypdndthereaiegetheratio -changesothattheleverage andpower is materially increased during the 'actual braki,ing-operation'without'altering thevspeed or power utilized at thehand-wheel. While the structure is hereindisclosed for convenience inconnection with a brake mechanism, it, of course,"may be employed inconnection with any structure where the principles thereof may beindicated for the services desired. In carrying out my invention I havemade 'use of several types of 'gearing and have embodied the samel intwo gear elements that mesh with each other in such.

manner that a continued rotation of -the power or driving gear will betransmitted to the' driven gear by a diiferentlal'action so that thelatter gear will be actuated at several speeds and under a cha-nge -ofleverage or ratio between the toothed faces of the respective elements.

It is also aobject of my invention to provide Va gearing that isextremely compact in its arrangement, that is dependable 1n operation,that is simple in construction and will not readily get out of'order,and

that is dependable 1n erforming. the func;-

tionsA for which it has en designed, .besides being economical tomanufacture so that it ma be sold for a moderate price.

prefer to carryout my invention in substantially the manner hereinafterfully described and as vmore particularly pointed My invention relatesto gearing and more the struc-` ippiiaaoxi akanne1: 15, 1924. seran mi.esame.

out in the claims, reference being had to the this specification, in'which, Figure 1 is a to plan of my gear mecha` nism in assemble 'formand mounted fin a suitable retainer for use in connection withaccompanying drawings that form a part of -the handoperated'bralremechanism of :a

railway car. e

' Figure 2 is avertical side elevation o the structure shown in Figure- 1. i

Fi ure 3 is a top plan of the gearing illustrate in Figure 1 and withthe retainer and other parts removed to disclose the relativepositionfof the gear elements when vthe in itial movement begins.

Figure 4 is'aview of the elements shown in F1gures-3 and -4r 'atan-interme'diat posi-'fi tion. r l g., ....Figure 6 is a sideelevatio'nlof 'tlielgear ele-- -ments in the pt si'ti'c'iii shown in-Figure 5.

in Figure 3, showing their relative o'sitions i The drawings showfatypical or preferred embodiment of my invention, and similar referencecharacters have been employed to designate the same parts wherever theyoccur throughout the several views. -Referring first to Figures 1 vand 2it willebe 4seen I provide a 'suitable housin consistin of a segmentalshaped vertical y dispos wall 10, preferably of semi-circular contour,the upper edges of which are'connected by va top or cover 11, that hasAan irregular outer edge that provides screw-lugs 12 and a. req cessedportion 13. A skeleton or cuen frame is secured by bolts or the liketo'tne lugs 12 of the structure just described and consists of atransverse member 14 vfrom the opposite ends of which projectconvergingarms 15, which at their point of juncture provide a centralbearing 16 for the vertical spindle 17 of the drivengear to the upperend of which the actuating hand-wheel (not shown) is secured in theusual manner. Extending outwardly and downwardly from the lower portionof the skeleton frame is a single arm 18, the lower end of 4which isdeflected horizontally and terminates in a bearing boss 19, for thelower end of thev driven spindle 17 and is below and in alinement withthev upper bearing boss 16. The transverse member '14 has a downwardlyextending boss 20. at about its center of length below the re-v cessedportion 1310i the top plate that-pro-` los" for the 'spindle 21 of thedrive gear, an

'is provided at the upper end of the arm 1.8

heretofore mentioned for the lower end of said s indle. The structureheretofore describe while it is desirable when the gearing is used inconnection with a hand-brake for railway cars, is not, however,essential to the successful operation of the gearing herein disclosed,and, as any suitable means may be provided for mounting the gearingstructure,`the same forms no part of my present invention.

The drive gear,.as seen in the drawings, preferably consists of aspur-gear 23 that forms what might be termeda hub .for said drive gear.The teeth of this spur-gear 23 however may not extend entirely aroundthe same in a concentric manner but'may terminate in a block 24 so as tostop the "urther'i'otation'of the structure. Extending from thespur-gear is an inclined scrollgear in the form-of 'aneccentricjlange25, having upon its edge a i lurality of teeth 26 so that there is provied' a spiral gear, that is eccentric to or.` forms a convolute aroundthe spur-gear with its smallest radius .at the spur-gear.- Thus itwill,V be seen the driving gear consists ofA a relativelysmall spur thatmerges into an eccentric gear that is disposed spirallyl and inclinedwith re- .spect to said spur and the same is mounted upon the drivingspindle 21 heretofore mentioned.

The driven element of this gearing comprises a scroll or spiral gear 'ofa Vmodiiied construction and consists of a fiange or spirally inclinedplate having a plurality of teeth 28 upon its edge that are adapted tomesh with the-teeth 26 of the driving-element. The teeth 28, of course,are s irally,-

arranged and extend in an inclined p ane so that they will mesh withlall of the teeth 26:12u the spiral and eccentric portion of the drivingf member. Part wa around its periphery, the flange o i' inc ined plate27 changes its form from a convolute to a yconcentric arrangement yasati the sector-29, but continues in an inclined plane, and the edge ofthis concentric portion 'is'provided vwith teeth '30 arranged concentricwith the'hub or axis ofthe driven member so that the latter teeth 30will mesh with the concentric teeth 23 which form the spilli-gear 23.

In its initial position, illustrated in detail in Figures 1, 2 and 3 ofthe drawings, the teeth 26 of the eccentric flange 25 on the drivingmember are in mesh with the teeth 28.on the eccentrieor scroll portionof the driven member, and when the driven member is rotated in thedirection of the arrow (Figure 3), the driven member will be actuatedrapidly and, in the case of a brake on a railway' car, there is littleor no resistance to be overcomeand the slack in the .tending from saidspur gear.

chain will be rapidly or quickly taken'np. Upon the respective gearmembers reaching the positions shown in Fi res 5 and 6 the slack in thechain4 or cab e will have'been entirely taken up" and the power willtheir begin to be apphedto the brake itself. It wil be seen that thedriving member will now be employingthe spur-gear'teeth 23 inVcooperation or in mesh with the teeth 30 on the concentric portion ofthe driven member ing 'av relatively large gear or sector at av slowerspeed than initially but with increased power. This will continue untilthe brake has been entirely set, or the spur-gear will have reached itsend or block 24, at which point further rotation of the structure -isn'ot effective or may be stopped. -It will be noted that the iianges,whenthe concentric ortion of the two members are in mesh, will epassingone above the other, and this is rendered possible b the formingof the anges in an incline andv spiral manner. It will also be seen thata complete rotation of the driven member is obtained by one and a thirdrotations of the'drive member.

It -is obvious that divers modiiications and refinements of thestructure which has been illustrated and described ma be made withoutmaterially departing l rom the prinvciple's of my invention. y Itherefore desire iii-understood that all such changes are fullycontemplated as .coming within the scope of the appended claims.

What I claim is 1. A gearing comprising two unitary gears-in engagementwith each other, a portion of the teeth on each gear being eccentric andoblique to the-axis of rotation and the remaining portion beingconcentric to the axis of rotation of the respective gears.

2. A gearing comprising a spur gear, a convolute flange' the periphery`of which merges into said spur gear, a segmental gear adapted to engagesaid spur gear, and a gear element the periphery of which extends in aconvolute from said segmental ear and adapted to engage the convoluteange eilt'- '3`.""'A gearing comprising a spur gear a toothed iiange'theperiphery of which un tends in a convolute from said spur gear and and"a to'qthed elemer.; the periphery of which extendsin a convolute fromsaid segmental gear and inclined with respect there- 4. gearingcompris-ing a spur gear, a

is? inclined with respect thereto, a segmental fgear-fadapted to mesh Y.ith said spur gear;

flange the periphery of which extends in an outwardly direction in a-convolute and at "s inner end merges into said spur gear, a

. sai

segmental gear adapted tolengage said spur gear and a gear element the(periphery of whic extends in'an inwardly irection and 4in a convolutefrom said segmental gear and adapted to engage the ange extending fromspur gear.

5. A gearing comprising a spur gear, a toothed flange the periphery ofwhich extends in amoutwardly direction and in a convolute' from saidspur gear and is inclined with respect thereto, a segmental vgearadapted to mesh with' said spur ear, and a toothed element, theperiphery o? which extends in an inwardly direction and in a convolutefrom said segmental gear and in- 'clined with respect thereto, saidtoothed element adapted to mesh withjthe toothed` flange extending fromsaid spur gear. I

6. A gearing comprising two gear elements, each arranged obliquely vandengaged with each other, a portion of the edge of ach element beingdeveloped on a convoute.

7. A gearing comprising two interengaging scroll gears disposed inplanes oblique to their axes of rotation.

8. A gearing comprising two gears dis- 'posedin planes oblique to theiraxes Aof rotation, one of saidgearsjterminating' 1n a spur pinion atlits hub that is engageable with a portion of .the other gear.-

9. A gearing comprising a scroll gear terminating at its outer portionin a vconcentric gear segment,'and a second scroll gearadapted to meshwith the first scroll gear and terminating at its inner end in aconcentric gear segment adapted to mesh with the lirst-'mentionedconcentric gear segment said scroll ears being 'arranged oblique to theaxes ci; rotation.

'ranged to .interengage in constantly changing planes during rotationalengagement.

12. A gearing comprising two gear ele ments each having concentric andeccentric portions adapted to continuously interen-l gage in sequencethroughout rotation and in constantly changing planes of engagement;

13. In gearing, a gear having concentric and eccentric portions, and asecond gear the axis of which is spaced a xed distance from the axis ofthe first gear, said second gear shaped soas to continuously engage withsaid first gear and adapted to drive the same at a gradually changingspeed and then at a xed ratio, said eccentric portion being arrangedoblique toits axis ofrotation.

14. A- gearing comprising two gear 'elements each having concentric andeccentric portions adapted to continuously interengage in sequencethroughout rotation and portions of which pass 1n superposed relationduring rotation.

Signed at Chicago, county of Cook and State of Illinois, this 5th day ofMarch 1924.

FRED MATHEWS.

